All-optoelectronic continuous wave THz imaging for biomedical applications

We present an all-optoelectronic THz imaging system for ex vivo biomedical applications based on photomixing of two continuous-wave laser beams using photoconductive antennas. The application of hyperboloidal lenses is discussed. They allow for f-numbers less than 1/2 permitting better focusing and...

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Bibliographic Details
Published in:	Physics in medicine & biology Vol. 47; no. 21; p. 3743
Main Authors:	Siebert, Karsten J, Löffler, Torsten, Quast, Holger, Thomson, Mark, Bauer, Tobias, Leonhardt, Rainer, Czasch, Stephanie, Roskos, Hartmut G
Format:	Journal Article
Language:	English
Published:	England 07-11-2002
Subjects:	Animals Biotechnology - instrumentation Biotechnology - methods Diagnostic Imaging - instrumentation Diagnostic Imaging - methods Dogs Electromagnetic Phenomena - instrumentation Electronics, Medical Equipment Design Equipment Failure Analysis Lasers Microwaves Neoplasms, Basal Cell - diagnosis Optics and Photonics - instrumentation Semiconductors Sensitivity and Specificity Skin Neoplasms - diagnosis Spectrophotometry - instrumentation Spectrophotometry - methods Stochastic Processes
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Summary:	We present an all-optoelectronic THz imaging system for ex vivo biomedical applications based on photomixing of two continuous-wave laser beams using photoconductive antennas. The application of hyperboloidal lenses is discussed. They allow for f-numbers less than 1/2 permitting better focusing and higher spatial resolution compared to off-axis paraboloidal mirrors whose f-numbers for practical reasons must be larger than 1/2. For a specific histological sample, an analysis of image noise is discussed.
ISSN:	0031-9155
DOI:	10.1088/0031-9155/47/21/310